how do i run a .3 A 120 v ac electric motor with dc. how do i know the rate of revolutions? and how do i overclock it?
Hi Michael; Batteries produce Direct Current (DC) where the motor you speak of requires Alternating Current (AC). No matter how many batteries you stack together, the motor will not run. To use batteries to make the AC motor run, you would need a converter to convert the DC current to AC current. Hope this helps!
How to run a gasoline motor with diesel, or vice versa? While similar, the technology is still different. Doesn't work. You need equipment to convert the DC supply voltage to AC, which is generally referred to as an voltage inverter. While the speed of DC motors vary by voltage, the speed of AC motors is frequency dependent. Speed controls on AC fans (such as ceiling fans) are switched by different sets of capacitors which do not change the voltage, but instead change the frequency being sent to the motor.
You can run the motor from a voltage inverter that changes the 12 VDC to 120 VAC. You can get an inverter from many places. Wal Mart and Radio Shack carry them. Most sporting goods and camping stores carry them as well. The motor should run from an inverter but may not run at full power. Most inverters don't put out a very good AC and this reduces the power of the motor. The type of motor will depend on how fast it runs. A universal motor will run off about any voltage and it's speed will depend on the voltage applies. It will run from AC or DC voltage. This is how a variable speed motor such as in a drill works. A synchronous motor's speed depends on the frequency of the AC power. A clock motor is synchronous and keeps time independent of voltage variations as long as the frequency is constant. The RPM of a synchronous motor depends on the frequency of the AC and the number of poles of the motor. The formula is the AC frequency times120 divided by the number of poles of the motor. The 2 links below provide more details of the 2 types of motors.
As Percival said, speed is a factor of Hertz (frequency). If you plug the motor into a regular AC outlet, it will run the speed it was designed to. If you want to be able to control the speed, you would have to be able to control the frequency of the AC you are supplying it. To do that, you can do like Percival suggested and connect various capacitors across the AC input or buy a VFD. VFDs (Variable Frequency Drives) are a bit more pricey. And to be quite honest, I've never seen a single-phase VFD for 110volts. You can find capacitors of various values at your local Radio Shack.
